Hanger for use in concrete ceilings



H. H. CRAWFORD.

HANGER FOR USE IN CONCRETE CEILINGS.

APPLICATION FILED IUNE 30, 1919/.

Patented Sept. 20, 1921i.

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E. GRAWFORD, GIF CHICAGO, ILLNOS.

FR USE ,1N CONCRETE CEILINGS.

Specicaticn of Letters Patent.

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Be it known that l, Hanny Il. CRAWFORD, a citizen of the United States, and a resident of Chicago, illinois, have invented a certain new and useful Improvement in Hangers for Use in Concrete Ceilings, of

-which the following is a specification.

A ceiling for'the story below, and after the concrete has once set it is diilicult, indeed, to fix or anchor fastening devices therein.

It is an object of my invention to provide a hanger, or fastening device which can be embedded in the concrete at the time it is poured, and which shall be so effectually anchored therein that it shall be adapted to support extremely heavy loads.

Another object of my invention is to provide a device of this character which, while composed 4of very little metal shall be of extremely rigid and durable construction.

Again it is an object of my invention to provide a hanger or fastening device wherein portions of Ithe metal shall be so disposed tha't the device shall not only be strengthened thereby, but shall also coperate in a manner to iirmly anchor the device in the concrete ceiling.

Another object of my invention is to provide a method of making a hanger, of the above character, which method shall be characterized by a plurality of steps that can be simply and eas1ly practised with tools found in any ordinary machine shop; and in which the various parts can be quickly and easily assembled into an inseparable whole, all by 'the use of unskilled labor.

My invention consists generally in a hanger or supporting device, and in a method of producing the same, whereby the above named objects, together with others that will appear hereinafter, are attainable; and my invention will be more readily -understood by reference to the accompanying drawings which illustrate what I conslder, at the present time, to be the preferred form of hanger and the preferred method of producing it.

In said drawings: Figure l, is a detailed sectional view showing my hanger embedded 1n a concrete ceiling and showing the temporary concrete supporting structure in place. Fig. 2, is a perspective view of a piece of metal constituting part of the hanger before the same has been pressed or formed to desired shape. Fig. 3, is a side view illustrating the metal piece of Fig. 2, after it has been pressed into desired shape. Fig. 4:, is a'plan view of the member of Fig. 3. Fig. 5, 1s a plan view, and Fig. 6 is an end elevation of a piece of thin sheet metal lpressed or stamped to a form adapted to cooperate with the metal member of Fig. 3. F ig: 7 is a side elevation, and Fig. 8 is a plan view similar to Figs. 3 and 4, but

illustrating the cover member depicted in Figs. 5 and 6, pressed into place; and Fig. 9 is an enlarged detailed view illustrating the manner in which the cover member is held in place.

In the erection of concrete buildings or buildings having concrete floors and ceilings a temporary support-ing structure is erected, usually formed of wooden planks, and the concrete is poured thereon, suitably reinforcing, having first been properly arranged. .After the concrete has set sufficiently the temporary structure or support is removed.

In many buildings, particularly factory or Shop buildings it is customary to hang line shafting, piping and numerous other devices from the ceiling. Where the device to be supported is a line shaft, piping or the like -a large number of supporting devices must be provided throughout the length of the building, which devices must be in alinement or of such construction that `the supporting portion can be readily alined. I have devised a hanger or supporting device which can be embedded in concrete at the time it is poured, and still leave the supportin part or element that depends from the ce1l ing freely movable so that it can beadjusted as may be necessary to secure th desired alinement.

Inasmuch as it was necessary for me to devise a method of producing the article I shall first describe the method of production and then add such additional description as may be necessary to describe the article of manufacture resulting therefrom,

From a strip of channel cross-section I shear apiece 1, as shown in Fig. -2 of a length suitable for, the particular-hanger or supportin device desired. As a next step I press yor orm thei member 1 to the shape shown in Fig. 3,'by reference to whichV it will be seen that it comprises a lower centrally disposed horizontal portion 2, two upper substantially horizontally disposed portions 3 and Il, and inclined connecting portions 5 and (l. In the operation of changing the channel section or piece 1 of Fig. 2, to the form 'shown in Fig, 3, I also form an elongated slot 7, centrally in the bottom of the channel, The slot 7 is'of a width sufficient to accommodate the shank portion of a bolt 8 (see Figs, 1, 7 and 8) the head of which extends beyond the sides of the slot so that the bolt hangs therefrom. The bolt 8 ma assume different forms for supporting di erent devices but as here in dicatedl it is merelythreaded at the end and provided with a nut 8 of usual form. Inasmuchas a number of fastening devices will be provided and inasmuch as the bolts 8 ofy the respective devices may not be in exact alinement it'may be necessaryl after the hanger has been embedded in the concrete and the supporting structure removed` to ,shift the bolt 8 in the slot 7 This could not be done if the concrete were permitted to find its way into the bottom of the channel for obviously the head of the bolt would then beiirml embedded in concrete and all movement e ectually prevented, In order to prevent any such action I provide means for effectually preventing the concrete from flowing into the bottom portion 2 of the channel, This means takes the form of a light metal stamping shown in Figsl 5 and 6, and composed .of a central elevated portion or shelf 10, two base or side portions 11 and 12, and the connecting side walls 13 and 14, The distance between the side walls 13 and 14 is just sufficient s0 that the member can be placed over the lower central portion 2 of the channel with the inner faces of the walls 18 and '14 closely adjacent the outer side faces of the channel.

' From the opposite ends of the central portion 10, of the cover member, proj ect tonguelike portions 15 and 16 which, as is well shown in Figs, 7 and 8, extend into contacting relation to the bottom wall of the inl clined portions 5 and 6, of the channel hanger, and the inclined side edges 15', 15, 16', and i8 of the tongues lvand 16 are angled so that they very closely follow the inclined portions 17 and 18 of the channel side Ranges,

As before stated, the portionsy 5 and 6 of the channel are inclined downwardly and embeds itself into all portions of the channel and 'elfeetually seals the same in such a manner that it becomes impossible for concrete to flow thereby.

Duringfthe same operation in which. the cover is pressed into place, I prefer to perform an operation whereby the cover member shall be positively held in place against accidental separation, for it will be understood that these hangers or supporting devices are assembled with the bolt nut in place and the hanger complete as a unit before it is placed in the concrete, as before described, and that the device may receive rough handling before it is actually used, In order to sov lock: or bind the cover member into place I crowd some of the metal from the side lflanges of the channel, preferably at four points where the cover membermeets the channel, thus providing metal tongues 19, 20, 21, and 22 which, as is well shown in detailed view in Fig, 9', extend over and serve to clamp the cover tightly in place.

It will be understood that the hanger devices mu-st be positioned properly before the concrete is poured and to'this end I provide the baseportions 11 and 12 of the cover members with holes 23 and 24 whereby the hanger as a whole can be fastened, as by means of brads or nails 25, to the concrete supporting structure 26 (see Fig. 1), This serves to hold the hanger in place until the concrete is poured.

The device is at once simple in construction; the channel form and its angular dis position lends great rigidity'to the device and at the same time forms a larger number of pockets which assist in firmly anchoring the hanger in place; the cover member is so formed that it can be quickly and easily assembled with the channel; and all of the' operations can be performed upon an ordinary punch or other light press. The steps of manufacture are relatively few in numi ber, and readily practisable by even an unskilled workman.

In the specification or claims where I state that the bolt has its head on one side vnot wish to be limitedv to the specific device 1,aeo,ess l herein shown or described, nor to the preoise steps ofthe method or to the stated sequence thereof, except only as may be necessary b. limitation in the hereunto appended c aims.

I claim:

1. A hangery embodying therein a metal channel member of substantially the same cross-sectional size throughout and having its lower central portion provided with a bolt hole, continuations thereof which incline upwardly from each end of the lower central portion, a bolt having its head on one side of the channel and its shank extending through said hole, and a cover member positioned over the lower central portion, engaging the side walls of the channel and having end portions that extend into wedging engagement with said upwardly inclined continuations thereby forming a housing for said bolt.

2. A hanger embodying therein -a metalchannel member of'substantially' the same cross sectional size throughout and having a.

lower central portion provided with a bolt hole, portions inclined' upward from the lower central portion, a bolt having its head on one side of thechannel and its shank extending through said hole, a cover member positioned over the lower central portion, engaging the side walls of the channel and having end portions that extend into wedging engagement with said upwardly ;inl clined portions thereby forming a housing for said bolt, land lip portions on said channel, extendingA over said cover member and holding vit against removal.

3. A hanger embodying therein a metal channel member of substantially the same cross sectional size throughout and having a horizontally disposed lower central portion, two higher end portions and inclined portions extending therebetween,` said lower central portion having a bolt hole therein, a bolt having its head.v on one side of the channel and its shank extending through vsaid hole' and' a cover member positioned over the lower centra-l portion, engaging the side walls ofthe channel, and having end portions that extend into wedging engagement with said inclined portions thereby forming a housing for said bolt.

- 4. A hanger embodying therein a metal channel member of substantially the same cross sectional size throughout and having a'horizontally disposed lower central ortion, two higher end portions and inclmed portions extending therebetween, said lower central portion having a bolt hole therein, a bolt having its head on oneA side of the channel and its shank extending through said hole, a` cover member positioned over the lower central portion, engaging the side wallsvof the channel, and having end portions that extend yinto wedging eng ment with said inclined rtlons there y forming a housing for said olt, and lip po tions yon said channel, extending over said cover member and holding same against removal. V

In testimony' whereof I have hereunto set my hand, this 25th day of J'une,1919.

\ HARRY H. CRAWFORD. 

